Service Manual

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4) Close the low-side valve and high-side valve on the gauge manifold.
5) Disconnect the gauge manifold hose from the vacuum pump and attach it to a
refrigerant service cylinder. Remember to loosen the connection and purge the air from
the hose. See the nameplate on the SRK for the required refrigerant charge. Hoshizaki
recommends only virgin refrigerant or reclaimed refrigerant which meets ARI Standard
700 (latest edition) be used.
6) A liquid charge is required when charging an R-404A system (to prevent fractionation).
Place the service cylinder on the scales; if the service cylinder is not equipped with
a dip tube, invert the service cylinder, then place it on the scales. Open the high-side
valve on the gauge manifold.
7) Allow the system to charge with liquid until the proper charge weight is met.
8) If necessary, add any remaining charge to the system through the low-side. NOTICE!To
prevent compressor damage, use a throttling valve or liquid dispensing device to
add the remaining liquid charge through the low-side service valve with the unit
running.
9) Close the high and low-side service valves. Close the high and low-side gauge manifold
valves, then disconnect the gauge manifold hoses.
10) Cap the service valves to prevent a possible leak.